cmd/fejkdata/main_test.go

@@ -301,21 +301,34 @@ func TestRunShippedDataByDefault(t *testing.T) {
 	}
 }
 
-func TestIsTemplate(t *testing.T) {
-	for arg, want := range map[string]bool{
-		"sv_SE.person":   false,
-		"person.last":    false,
-		"[abc]":          false, // a [ that is not valid JSON is not a template
-		"[abc].field":    false,
-		"name: {x}":      true, // a { token: a path can never carry a brace
-		`{"format":"x"}`: true,
-		`["a","b"]`:      true, // a JSON array carries no brace
-		`[1, 2]`:         true,
+func TestClassify(t *testing.T) {
+	for arg, want := range map[string]argKind{
+		"sv_SE.person":   argPath,
+		"person.last":    argPath,
+		`"abc`:           argPath,     // a quote opening no JSON string is part of a name
+		"name: {x}":      argTemplate, // a { token: a path can never carry a brace
+		`{"format":"x"}`: argTemplate,
+		`["a","b"]`:      argTemplate, // a JSON array carries no brace
+		`[1, 2]`:         argTemplate,
+		`"hello"`:        argTemplate, // a JSON string, the spelling a format-only object names
 	} {
-		if got := isTemplate(arg); got != want {
-			t.Errorf("isTemplate(%q) = %v, want %v", arg, got, want)
+		got, err := classify(arg)
+		if err != nil || got != want {
+			t.Errorf("classify(%q) = %v, %v; want %v", arg, got, err, want)
 		}
 	}
+	for _, arg := range []string{"[abc]", "[abc].field", "x[1]", "a]b"} {
+		if _, err := classify(arg); err == nil {
+			t.Errorf("classify(%q) = no error; want the bracket rejected", arg)
+		}
+	}
+}
+
+func TestRunShapeMisuseBeforeLoad(t *testing.T) {
+	code, _, errb := runOut("--no-shipped-data", "[abc]")
+	if code != 2 || !strings.Contains(errb, "[abc]") || strings.Contains(errb, "--data-path") {
+		t.Fatalf("shape misuse with no data = %d, %q; want the shape error before any load", code, errb)
+	}
 }
 
 func TestRunInlineTemplate(t *testing.T) {
@@ -327,6 +340,10 @@ func TestRunInlineTemplate(t *testing.T) {
 	if code != 0 || (out != "name: bosse\n" && out != "name: lina\n") {
 		t.Fatalf("inline JSON template = %d, %q, want one name, stderr %q", code, out, errb)
 	}
+	code, out, errb = runOut("--seed", "1", `"name: {/sv_SE.person.last}"`)
+	if code != 0 || !strings.HasPrefix(out, "name: ") || strings.Contains(out, "{") {
+		t.Fatalf("inline JSON string = %d, %q, stderr %q", code, out, errb)
+	}
 	code, out, errb = runOut("--seed", "1", "-n", "2", `{digits(1)}`)
 	if code != 0 || len(strings.Split(strings.TrimRight(out, "\n"), "\n")) != 2 {
 		t.Fatalf("inline template with --repeat = %d, %q, stderr %q", code, out, errb)
@@ -339,11 +356,15 @@ func TestRunTemplateMisuse(t *testing.T) {
 		"[red,green]",     // a near-miss JSON array (unquoted strings)
 		`{"format":"x"}`,  // an object holding only a format
 		"{/no.such.path}", // a reference into nothing
+		"x[1]",            // a bracket no path may hold
 	} {
 		code, out, errb := runOut("--seed", "1", arg)
 		if code != 2 || out != "" || !strings.Contains(errb, "try 'fejkdata --help'") {
 			t.Errorf("run(%q) = %d, %q, %q; want misuse naming --help", arg, code, out, errb)
 		}
+		if strings.Contains(errb, "fejkdata: fejkdata:") {
+			t.Errorf("run(%q) doubled the program prefix: %q", arg, errb)
+		}
 	}
 }
 

inline_test.go

@@ -94,7 +94,7 @@ func TestFakeTemplateErrors(t *testing.T) {
 		{`"{x}"`, `no field "x"`},
 		{`"{digits(0)}"`, "must be positive"},
 		{`name: {/no.such.path}`, "no entry"},
-		{`name: {..nope}`, "no folder above"},
+		{`name: {..nope}`, "write {/nope}"},
 		{`{"format":"x"}`, "is a string"},
 		{`{/misc.country} {/misc.country.alpha2}`, "renders a level"},
 	} {
@@ -105,6 +105,23 @@ func TestFakeTemplateErrors(t *testing.T) {
 	}
 }
 
+func TestFakeTemplateJSONString(t *testing.T) {
+	f := shipped(t)
+	got := tmpl(t, f, `"name: {/sv_SE.person.last}"`)
+	if !strings.HasPrefix(got, "name: ") || strings.Contains(got, "{") {
+		t.Fatalf("FakeTemplate(JSON string) = %q, want a rendered last name after the prefix", got)
+	}
+}
+
+func TestPaddedJSONIsRejected(t *testing.T) {
+	f := shipped(t)
+	in := `{"format":"{x}","x":["a","b"]}`
+	_, err := f.NewTemplate("  " + in + "  ")
+	if err == nil || !strings.Contains(err.Error(), "write "+in) {
+		t.Fatalf("NewTemplate(padded JSON) = %v, want an error naming the unpadded spelling", err)
+	}
+}
+
 func TestNewTemplateReusable(t *testing.T) {
 	f := shipped(t)
 	tmpl, err := f.NewTemplate(`{digits(2)}`)

loading_test.go

@@ -275,8 +275,6 @@ func TestNewErrors(t *testing.T) {
 			map[string]string{"a|b": `"1"`},
 			`category "a|b" contains "|"`,
 		},
-		// A bracket is not a token-grammar character, but the CLI reads an argument
-		// starting with [ as a JSON array, so a name carrying one would be misread.
 		"field name with a bracket": {
 			map[string]string{"a": `{"format":"{x}","x":"1","b[c":"2"}`},
 			`field "b[c" contains "["`,
@@ -285,6 +283,10 @@ func TestNewErrors(t *testing.T) {
 			map[string]string{"[abc]": `"1"`},
 			`category "[abc]" contains "["`,
 		},
+		"field name with a quote": {
+			map[string]string{"a": `{"format":"{x}","x":"1","b\"c":"2"}`},
+			`field "b\"c" contains "\""`,
+		},
 		// An empty name is not a path segment, so List never offered it — while a
 		// bare {}, a trailing dot in Fake("a.") and a {/a.} reference all reached
 		// it. The engine accepted spellings it would never advertise.

one_spelling_test.go

@@ -47,3 +47,13 @@ func TestInertObjectIsRejected(t *testing.T) {
 		}
 	}
 }
+
+func TestInlineFolderSigilsAreRejected(t *testing.T) {
+	f := shipped(t)
+	for _, input := range []string{"{.sv_SE.person.last}", "{..sv_SE.person.last}"} {
+		_, err := f.NewTemplate(input)
+		if err == nil || !strings.Contains(err.Error(), "write {/sv_SE.person.last}") {
+			t.Errorf("NewTemplate(%q) = %v, want an error naming the root spelling", input, err)
+		}
+	}
+}